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from diffusers import StableDiffusionControlNetPipeline, ControlNetModel
from typing import Dict, List, Any
from io import BytesIO
from PIL import Image
import base64
import torch
# set device
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
if device.type != 'cuda':
raise ValueError("need to run on GPU")
# set mixed precision dtype
dtype = torch.bfloat16 if torch.cuda.get_device_capability()[0] == 8 else torch.float16
class EndpointHandler():
def __init__(self, path=""):
self.stable_diffusion_id = "stabilityai/stable-diffusion-2-1-base"
controlnet = ControlNetModel.from_pretrained("rgres/Seg2Sat-sd-controlnet", torch_dtype=torch.float16)
self.pipe = StableDiffusionControlNetPipeline.from_pretrained(
self.stable_diffusion_id, controlnet=controlnet, torch_dtype=dtype, safety_checker=None
).to(device)
def __call__(self, data: Any) -> List[List[Dict[str, float]]]:
"""
:param data: A dictionary contains `inputs` and optional `image` field.
:return: A dictionary with `image` field contains image in base64.
"""
prompt = data.pop("prompt", None)
image = data.pop("image", None)
steps = data.pop("steps", 30)
seed = data.pop("seed", 0)
steps = int(steps)
seed = int(seed)
# Check if neither prompt nor image is provided
if prompt is None and image is None:
return {"error": "Please provide a prompt and base64 encoded image."}
# decode image
image = self.decode_base64_image(image)
self.generator = torch.Generator(device="cpu").manual_seed(seed)
# run inference pipeline
image_out = self.pipe(
prompt=prompt,
image=image,
num_inference_steps=steps,
generator=self.generator
).images[0]
# return first generate PIL image
return image_out
# helper to decode input image
def decode_base64_image(self, image_string):
base64_image = base64.b64decode(image_string)
buffer = BytesIO(base64_image)
image = Image.open(buffer)
return image
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